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Injection Molding Defects and Solutions -- Flash and Burrs
2025-10-17
Flash and Burrs: When the molten material enters the gaps between the mold parting surfaces or the joints between the mold and the slider, excess thin fins or burrs appear on the molded part. 4.1 Causes 4.2 Solutions 4.1.1 Poor closing or misalignment at the parting surface. 4.2.1 Increase clamping force; repair the mold parting surface to ensure tight fitting. 4.1.2 Excessive clearance between th...
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Injection Molding Defects and Solutions -- Silver Streaks
2025-10-17
Silver Streaks: Shiny, silvery lines appearing on the surface of the molded product or near the gate along the flow direction. These are caused by excessive moisture or volatile substances in the material, poor adhesion between the melt and the mold, or rapid cooling after the melt has been subjected to excessive shear stress—resulting in needle-like or mica-like streaks. In addition, if the silve...
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Injection Molding Defects and Solutions -- Sink marks
2025-10-11
Sink Marks (Depressions) Surface dents or depressions appear on molded parts. This defect occurs when the molten resin shrinks in volume during cooling and solidification but is not sufficiently compensated by additional material. It often appears on the backside of thick sections or behind ribs. Causes (2.1) Solutions (2.2) 2.1.1 Runner or gate too small, or insufficient number of gates. 2.2.1 Im...
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Injection Molding Defects and Solutions -- Incomplete filling
2025-10-11
Short shot / Incomplete filling The molten resin cannot completely fill the mold cavity. Causes (1.1) Solutions (1.2) 1.1.1 Injection volume insufficient; not enough material added. 1.2.1 Increase the material feed. 1.1.2 Inadequate plasticizing capacity or insufficient residual material. 1.2.2 Replace the machine or adjust process parameters to increase residual material. 1.1.3 Plastic particle s...
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